CN105134573B - A kind of plunger combination formula numerical variable pump - Google Patents
A kind of plunger combination formula numerical variable pump Download PDFInfo
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- CN105134573B CN105134573B CN201510492036.0A CN201510492036A CN105134573B CN 105134573 B CN105134573 B CN 105134573B CN 201510492036 A CN201510492036 A CN 201510492036A CN 105134573 B CN105134573 B CN 105134573B
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Abstract
The invention discloses a kind of plunger combination formula numerical variable pump.It includes multiple plungers, multiple oil sucting one-way valves, multiple oil extraction check valves, multiple two-position two-way electromagnetic stop compositions.The inlet port of each plunger is by oil sucting one-way valve and fuel tank UNICOM；The force feed mouthful of each plunger is connected by pressing oil check valve with high-pressure oil passage；The force feed mouthful of each plunger is bypassed by two-place two-open stop type magnetic valve；Actual displacement when digital displacement variable pump works is obtained by the discharge capacity superposition of the plunger of all normal oil extractions；The control of discharge capacity is realized by the corresponding discharge capacity of the single plunger of electromagnetism valve regulation, so that input response of the displacement variation of numerical variable pump to electric signal is very fast, so as to meet the requirement of high frequency sound control.The present invention can efficiently solve that the pressure loss in big flow servo, ratio electrohydraulic control system is big and the low deficiency of frequency response, while reaching significantly energy-saving effect.
Description
Technical field
The present invention relates to a kind of plunger combination formula numerical variable hydraulic pump.More precisely, it is related to a kind of using multiple posts
The oil extraction combination of plug controls to realize the digital control of hydraulic pump instantaneous displacement.
Background technology
Current electrohydraulic control system widely uses the components such as proportioning valve or servo valve and realizes servo, ratio control,
But this kind of technical scheme has clearly disadvantageous：
1. the pressure loss is big, and energy utilization efficiency is low.Because the general principle of valve prosecutor case is to use throttle grverning principle,
Its shortcoming is exactly the presence of restriction loss, and energy ezpenditure is big, and system heat generation is serious, causes hydraulic system unstable or event occurs
Barrier.Particularly for big flow proportional servosystem, the pressure loss is particularly acute.
2. frequency response is low during big flow.For big flow proportional servosystem, because hydraulic power is larger, proportioning valve or watch
Taking the control of valve needs to be realized using multi-stage guide valve, and its frequency response is difficult to meet real work requirement.
In order to avoid valve control system above-mentioned two in terms of deficiency, pump control cylinder technology arises at the historic moment.It uses adjustment with volume
The mode of speed controls position and the speed of hydraulic cylinder, with energy-conservation, efficiently, the advantage such as response is fast.Additionally, pump control cylinder system is easy
It is a kind of to realize having for hydraulic technique energy-conserving and environment-protective such that it is able to realizing portable arrangement and controlling in being designed to closed system
Effect approach, is also one of developing direction of electro-hydraulic technology.
The content of the invention
The present invention proposes a kind of plunger combination formula numerical variable hydraulic pump.Its main target is in high-pressure high-flow load
In the case of, the digital control to flow is realized, and response frequency is high, to replace existing servo valve, proportioning valve or numeral
Cylinder scheme.Avoid that the pressure loss in big flow servo, ratio electrohydraulic control system is big and the low deficiency of frequency response, while reaching
The significantly effect of energy-conservation.
In order to realize above-mentioned technical characterstic, the present invention is adopted the following technical scheme that：Plunger combination formula numerical variable pump, it is single
Comprising the different hydraulic plunger of multiple discharge capacities, (number of plunger can determine that the present invention will be with 7 according to concrete application in the pump housing
Illustrated as a example by individual plunger, numbering is A-G), 7 oil sucting one-way valves, 7 force feed check valves, 7 two-position two-way solenoid valves cut
Only valve.
7 described plunger oil extraction pressure are identical, and this 7 plunger is by motor belt motor bias wheel drive, and motor speed is constant.Motor
Rotating speed can be determined according to concrete application occasion, typically be selected with total optimization.
The discharge capacity value of 7 plungers is respectively：The discharge capacity of plunger A isq, the discharge capacity of plunger B-G is respectivelyq, 2q,
4q, 8q,16qWith 32q, then the maximum discharge capacity of system be 7 discharge capacity summations of plunger i.e.：64q.If flow is needed for system
200lpm, the then desirable 6.25lpm of the flow of pump A.
The oil discharge outlet of the numerical variable pump is connected by oil extraction check valve with high-pressure work oil circuit, specific output circuit
Determined according to concrete application.
The inlet port of all plungers of the numerical variable pump is connected with fuel tank.
The corresponding swept volume of described each plunger of numerical variable pump has a two-position two-way electromagnetic stop, stop valve
Outlet be connected with fuel tank.
The numerical variable pump upper band digitial controller, controller receives instruction that system provides quickly to adjust each post
Plug whether oil extraction, the output flow of numerical variable pump is controlled in the way of volumetric speed control.
Described two-place two-open stop type magnetic valve, when it ends, during plunger outward movment, normal oil suction, plunger is past
In when moving, normal oil extraction, suction oil resistance very little.When it is connected, the direct oil return box of pressure oil（Pressure loss very little）, row
Oily check valve is closed all the time, then the plunger not oil extraction, and other plungers do not receive any influence.
Whether the discharge capacity of the numerical variable pump depends on this 7 plunger oil extractions（Changes in flow rate is 0-32qBetween it is whole
Number）.Therefore the discharge capacity of whole pump is less than 32qNumerical value inqIntegral multiple arbitrarily change, thus final displacement control essence
Degree depends on the discharge capacity of minimum plunger.
During described numerical variable pump work, motor band movable eccentric wheel uniform rotation always.When certain plunger need not be supplied
When oily, hydraulic oil therein is taken back fuel tank, and oil return box drag losses very little, thus corresponding energy consumption also very little.And work as
When needing its fuel feeding, need to only give two-position two-way electromagnetic stop one pumping signal.Therefore its response depends on the sound of magnetic valve
Speed is answered, and it is unrelated with the dynamic response of motor and pump.Because the control of discharge capacity is corresponding by the single plunger of electromagnetism valve regulation
What discharge capacity was realized, and magnetic valve can realize quick response, so that the displacement variation of numerical variable pump is to electric signal
Input response it is very fast, so as to meet the requirement of high frequency sound control.When flow is bigger needed for system, only need to increase by one or
Multiple similar plunger and corresponding magnetic valve, the overall performance of system are barely affected, thus are very suitable for big stream
The situation of amount.
Plunger combination formula numerical variable hydraulic pump of the present invention mainly has following advantage：
1. whole system can realize flow from the zero to the multistage adjustable of maximum pump discharge, and maximum pump discharge depends on whole numeral
The summation of all plunger discharge capacities in variable pump.The precision of displacement control depends on the discharge capacity of minimum plunger.
2. when being applied to hydraulic system due to numerical variable pump, hydraulic cylinder directly can be controlled using numerical variable pump
Speed and position, without flow proportion valve, it is to avoid substantial amounts of restriction loss, therefore system pressure loss is very small, can
With significantly energy-conservation.
3. it has been observed that bypassing the oil extraction of single plunger using bi-bit bi-pass stop valve, then its frequency response can be very high, because
The flow control of this whole numerical variable pump can reach frequency response very high, overcome the frequency of traditional big flow ratio control system
Rate responds low difficulty.
4. system can be based on the transformation of existing plunger displacement pump completely, add standard two-position two-way solenoid valve, and structure is very
Simply, low cost, is only the use of new control strategy.
6. the number of the pump housing and pump housing inner plunger can as needed with specific arrangement requirement depending on.
7. higher in system control accuracy requirement, and in the case of metered flow is less, the plunger of reduced size is can select,
And for heavy traffic condition, then can select the plunger of large-size.
Brief description of the drawings
Fig. 1 is the system schematic of plunger combination formula numerical variable hydraulic pump of the present invention.
Specific embodiment
Design philosophy of the invention is illustrated below by schematic diagram.
As shown in figure 1, plunger combination formula numerical variable hydraulic pump of the invention is by 7 two-place two-open stop type magnetic valves 1,
7 oil suction unidirectional cone valves, 2,7 force feed check valves 3, seven plungers 4, and 7 groups of plunger return spring 5, eccentric wheel 6 and the pump housing
Into.
The structure of whole system is：The active force that all plungers all overcome back-moving spring by eccentric wheel drives, each plunger
Inlet port be connected with fuel tank, the connected mode of the oil discharge outlet of plunger determines according to actual needs.The corresponding work of each plunger
Make volume and fuel tank is all connected to by a two-place two-open stop type magnetic valve.
During numerical variable pump work, motor band movable eccentric wheel uniform rotation always.The discharge capacity of plunger A-G is respectivelyq,q,
2q, 4q, 8q, 16qWith 32q.The discharge capacity of pump is superimposed to realize by 7 discharge capacities of plunger, and discharge capacity is between 0-32q by two
The action of position two-way electromagnet cut off valve is controlled.
When certain plunger does not need fuel feeding, its oil-out is taken back fuel tank, and when its fuel feeding is needed, only need to be to two
Two-way cut-off type magnetic valve 1 applies pumping signal, and magnetic valve 1 is in cut-off state, and pressure oil directly pushes up the oily unidirectional cone valve that begins to rehearse
3, then the plunger is in oil extraction state.If for example, discharge capacity needed for system is 25q, then can be realized by following combination：1q（Post
Plug A）+ 8q（Plunger E）+16q（Plunger F）.Valve state is accordingly：The magnetic valve excited target signal being connected with plunger B, E, F is made
With and end, remaining conducting, direct oil return to fuel tank.
In the case where total displacement is certain, number of plungers is more, then the precision of displacement control is higher.
The present invention can effectively solve the problem that the pressure loss in the electro-hydraulic execution system of big flow servo, ratio is big and frequency response is low
Defect, while reaching significantly energy-saving effect.
Claims (5)
1. a kind of plunger combination formula numerical variable pump, includes the different hydraulic plunger of n discharge capacity, n oil suction list in the single pump housing
To valve, n force feed check valve, n bi-bit bi-pass electromagnetic type stop valve, it is characterised in that：
The inlet port of each plunger is by oil sucting one-way valve and fuel tank UNICOM；The force feed mouth of each plunger is unidirectional by force feed
Valve is connected with high-pressure oil passage；The force feed mouth of each plunger enters bypass by bi-bit bi-pass electromagnetic type stop valve；All plungers
The active force for all overcoming back-moving spring by eccentric wheel is driven, and the output circuit of electromagnetic type stop valve is cut in a working position
Only, then taken back to fuel tank in another working position；The discharge capacity of the numerical variable pump can be switched to set solid from null value rapidly
Amount；Actual displacement during numerical variable pump work is obtained by the discharge capacity superposition of the plunger of all normal oil extractions；
Described bi-bit bi-pass electromagnetic type stop valve, can open corresponding force feed single when it ends, during corresponding plunger oil extraction
To valve, pressure oil is normally discharged, and resistance is small；When it is connected, closed check valve is pressed oil, plunger does not arrange hydraulic oil；In plunger
Hydraulic oil directly flow back to fuel tank, and resistance is small；
The discharge capacity of the numerical variable pump can be according to institute's band displacement transducer or speed, acceleration sensing on hydraulic actuator
Device is controlled, sensor-based feedback, by quickly determine certain plunger whether oil extraction, controlled in the way of volumetric speed control
The position of executive component processed and speed；
The numerical variable pump, bi-bit bi-pass electromagnetic type stop valve is only just acted when needing to change the discharge capacity of variable pump, discharge capacity
During stabilization, electromagnetic type stop valve attonity is simple and reliable for structure.
2. a kind of plunger combination formula numerical variable pump according to claim 1, it is characterised in that：The control accuracy of its discharge capacity
Depending on the discharge capacity of minimum plunger.
3. a kind of plunger combination formula numerical variable pump according to claim 1, it is characterised in that：The response of its discharge capacity regulation
Time, depending on the commutating period of the electromagnetic type stop valve for being used.
4. a kind of plunger combination formula numerical variable pump according to claim 1,2 or 3, it is characterised in that：Described numeral
Using multiple pump housings, the inlet port that each pump housing can have multiple plungers, all plungers is all connected with fuel tank, force feed mouth point to formula variable pump
Multiple High voltage outputs of different displacements are not combined into；All plungers are driven by eccentric wheel, are dragged by single motor, and motor speed is permanent
It is fixed.
5. a kind of plunger combination formula digital displacement variable pump according to claim 4, it is characterised in that：The pump housing has m,
Common m × n plunger, the discharge capacity value of i-th plunger isq i , then the set solid amount of digital displacement variable pump is the discharge capacity of all plungers
Summationq 1 +q 2 +…+q i +…+q m×n ；The precision of its displacement control depends on the discharge capacity of minimum plunger, and its response time depends on
The response time of electromagnetic type stop valve.
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| CN201510492036.0A CN105134573B (en) | 2015-08-12 | 2015-08-12 | A kind of plunger combination formula numerical variable pump |
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| CN201510492036.0A CN105134573B (en) | 2015-08-12 | 2015-08-12 | A kind of plunger combination formula numerical variable pump |
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| CN105134573B true CN105134573B (en) | 2017-06-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109139590A (en) * | 2018-08-17 | 2019-01-04 | 合肥工业大学 | Become discharge capacity with streaming system based on switching flow and the open type digital pump for compiling strategy |
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| CN106089863A (en) * | 2016-08-23 | 2016-11-09 | 王林翔 | A kind of digital servo-hydraulic motor |
| CN110848126B (en) * | 2019-11-28 | 2020-12-25 | 兰州理工大学 | Plunger type digital pump |
| CN112879393B (en) * | 2021-01-12 | 2022-04-05 | 浙江大学 | Radial plunger digital variable hydraulic transformer |
| CN113374663B (en) * | 2021-06-28 | 2022-10-04 | 太原理工大学 | Hydraulic pump flow regulating device based on high-speed switch valve and regulating method |
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| CN114483674B (en) * | 2022-02-28 | 2024-03-19 | 浙江工业大学 | Radial digital pump capable of adjusting pressure impact and control method thereof |
| CN114962200B (en) * | 2022-05-11 | 2023-05-23 | 哈尔滨工业大学（深圳） | Multiple frequency cam digital pump |
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|---|---|---|---|---|
| JPH11257239A (en) * | 1998-03-16 | 1999-09-21 | Unisia Jecs Corp | Variable displacement plunger pump |
| US6176085B1 (en) * | 1999-06-08 | 2001-01-23 | Oganes Kirakos-Shirvanyan | Hydraulic drive system |
| CN201810542U (en) * | 2010-10-19 | 2011-04-27 | 郑州磨料磨具磨削研究所 | Ultrahigh-pressure variable radial plunger pump |
| CN102168671A (en) * | 2011-04-25 | 2011-08-31 | 许宏 | Electrical control variable plunger pump and pump control hydraulic system thereof |
| CN102425533A (en) * | 2011-09-23 | 2012-04-25 | 重庆工商大学 | Sinusoidal flow generating device |
| CN202991383U (en) * | 2012-11-20 | 2013-06-12 | 北汽福田汽车股份有限公司 | Pumping system and concrete pumping device with same |
| CN203430755U (en) * | 2013-08-22 | 2014-02-12 | 徐州徐工施维英机械有限公司 | Concrete pump reversing system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109139590A (en) * | 2018-08-17 | 2019-01-04 | 合肥工业大学 | Become discharge capacity with streaming system based on switching flow and the open type digital pump for compiling strategy |
| CN109139590B (en) * | 2018-08-17 | 2020-07-28 | 合肥工业大学 | Open type digital pump variable displacement flow distribution system based on switching flow distribution and marshalling strategies |
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